Bahasa kontrak pintar

1// SPDX-License-Identifier: GPL-3.0 // SPDX-License-Identifier: GPL-3.0
2pragma solidity >= 0.7.0;
3
4contract Coin {
5    // The keyword "public" makes variables // Kata kunci "public" membuat variabel
6    // accessible from other contracts // dapat diakses dari kontrak lain
7    address public minter;
8    mapping (address => uint) public balances;
9
10    // Events allow clients to react to specific // Event memungkinkan klien bereaksi terhadap
11    // contract changes you declare // perubahan kontrak tertentu yang Anda deklarasikan
12    event Sent(address from, address to, uint amount);
13
14    // Constructor code is only run when the contract // Kode konstruktor hanya dijalankan ketika kontrak
15    // is created // dibuat
16    constructor() {
17        minter = msg.sender;
18    }
19
20    // Sends an amount of newly created coins to an address // Mengirim sejumlah koin yang baru dibuat ke sebuah alamat
21    // Can only be called by the contract creator // Hanya dapat dipanggil oleh pembuat kontrak
22    function mint(address receiver, uint amount) public {
23        require(msg.sender == minter);
24        require(amount < 1e60);
25        balances[receiver] += amount;
26    }
27
28    // Sends an amount of existing coins // Mengirim sejumlah koin yang ada
29    // from any caller to an address // dari pemanggil mana pun ke sebuah alamat
30    function send(address receiver, uint amount) public {
31        require(amount <= balances[msg.sender], "Insufficient balance.");
32        balances[msg.sender] -= amount;
33        balances[receiver] += amount;
34        emit Sent(msg.sender, receiver, amount);
35    }
36}
Tampilkan semua
Salin

1# Open Auction # Lelang Terbuka
2
3# Auction params # Parameter lelang
4# Beneficiary receives money from the highest bidder # Penerima manfaat menerima uang dari penawar tertinggi
5beneficiary: public(address)
6auctionStart: public(uint256)
7auctionEnd: public(uint256)
8
9# Current state of auction # Status lelang saat ini
10highestBidder: public(address)
11highestBid: public(uint256)
12
13# Set to true at the end, disallows any change # Ditetapkan menjadi true pada akhirnya, tidak mengizinkan perubahan apa pun
14ended: public(bool)
15
16# Keep track of refunded bids so we can follow the withdraw pattern # Melacak penawaran yang dikembalikan sehingga kita dapat mengikuti pola penarikan
17pendingReturns: public(HashMap[address, uint256])
18
19# Create a simple auction with `_bidding_time` # Buat lelang sederhana dengan `_bidding_time`
20# seconds bidding time on behalf of the # detik waktu penawaran atas nama
21# beneficiary address `_beneficiary`. # alamat penerima manfaat `_beneficiary`.
22@external
23def __init__(_beneficiary: address, _bidding_time: uint256):
24    self.beneficiary = _beneficiary
25    self.auctionStart = block.timestamp
26    self.auctionEnd = self.auctionStart + _bidding_time
27
28# Bid on the auction with the value sent # Menawar pada lelang dengan nilai yang dikirimkan
29# together with this transaction. # bersama dengan transaksi ini.
30# The value will only be refunded if the # Nilai hanya akan dikembalikan jika
31# auction is not won. # lelang tidak dimenangkan.
32@external
33@payable
34def bid():
35    # Check if bidding period is over. # Periksa apakah periode penawaran telah berakhir.
36    assert block.timestamp < self.auctionEnd
37    # Check if bid is high enough # Periksa apakah penawaran cukup tinggi
38    assert msg.value > self.highestBid
39    # Track the refund for the previous high bidder # Lacak pengembalian dana untuk penawar tertinggi sebelumnya
40    self.pendingReturns[self.highestBidder] += self.highestBid
41    # Track new high bid # Lacak penawaran tertinggi baru
42    self.highestBidder = msg.sender
43    self.highestBid = msg.value
44
45# Withdraw a previously refunded bid. The withdraw pattern is # Tarik penawaran yang sebelumnya dikembalikan. Pola penarikan
46# used here to avoid a security issue. If refunds were directly # digunakan di sini untuk menghindari masalah keamanan. Jika pengembalian dana langsung
47# sent as part of bid(), a malicious bidding contract could block # dikirim sebagai bagian dari bid(), kontrak penawaran berbahaya dapat memblokir
48# those refunds and thus block new higher bids from coming in. # pengembalian dana tersebut dan dengan demikian memblokir penawaran baru yang lebih tinggi untuk masuk.
49@external
50def withdraw():
51    pending_amount: uint256 = self.pendingReturns[msg.sender]
52    self.pendingReturns[msg.sender] = 0
53    send(msg.sender, pending_amount)
54
55# End the auction and send the highest bid # Akhiri lelang dan kirim penawaran tertinggi
56# to the beneficiary. # ke penerima manfaat.
57@external
58def endAuction():
59    # It is a good guideline to structure functions that interact # Ini adalah pedoman yang baik untuk menyusun fungsi yang berinteraksi
60    # with other contracts (i.e., they call functions or send ether) # dengan kontrak lain (yaitu, mereka memanggil fungsi atau mengirim ether)
61    # into three phases: # ke dalam tiga fase:
62    # 1. checking conditions # 1. memeriksa kondisi
63    # 2. performing actions (potentially changing conditions) # 2. melakukan tindakan (berpotensi mengubah kondisi)
64    # 3. interacting with other contracts # 3. berinteraksi dengan kontrak lain
65    # If these phases are mixed up, the other contract could call # Jika fase-fase ini dicampuradukkan, kontrak lain dapat memanggil
66    # back into the current contract and modify the state or cause # kembali ke kontrak saat ini dan memodifikasi status atau menyebabkan
67    # effects (ether payout) to be performed multiple times. # efek (pembayaran ether) dilakukan berkali-kali.
68    # If functions called internally include interaction with external # Jika fungsi yang dipanggil secara internal mencakup interaksi dengan
69    # contracts, they also have to be considered interaction with # kontrak eksternal, mereka juga harus dianggap sebagai interaksi dengan
70    # external contracts. # kontrak eksternal.
71
72    # 1. Conditions # 1. Kondisi
73    # Check if auction endtime has been reached # Periksa apakah waktu akhir lelang telah tercapai
74    assert block.timestamp >= self.auctionEnd
75    # Check if this function has already been called # Periksa apakah fungsi ini sudah dipanggil
76    assert not self.ended
77
78    # 2. Effects # 2. Efek
79    self.ended = True
80
81    # 3. Interaction # 3. Interaksi
82    send(self.beneficiary, self.highestBid)
Tampilkan semua
Salin

1{
2    function power(base, exponent) -> result
3    {
4        switch exponent
5        case 0 { result := 1 }
6        case 1 { result := base }
7        default
8        {
9            result := power(mul(base, base), div(exponent, 2))
10            if mod(exponent, 2) { result := mul(base, result) }
11        }
12    }
13    let res := power(calldataload(0), calldataload(32))
14    mstore(0, res)
15    return(0, 32)
16}
Tampilkan semua

1type BookMsg = bytes[100]
2
3contract GuestBook:
4    pub guest_book: map<address, BookMsg>
5
6    event Signed:
7        book_msg: BookMsg
8
9    pub def sign(book_msg: BookMsg):
10        self.guest_book[msg.sender] = book_msg
11
12        emit Signed(book_msg=book_msg)
13
14    pub def get_msg(addr: address) -> BookMsg:
15        return self.guest_book[addr].to_mem()
16
Tampilkan semua